first commit

src/Camera.cpp

@@ -0,0 +1,123 @@
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "Camera.hpp"
+
+// Constructors
+
+Camera::Camera(
+    glm::vec3 position,
+    float fov_deg,
+    float fov_max,
+    float move_speed,
+    float mouse_sensitivity,
+    float fov_min,
+    float pitch_min,
+    float pitch_max,
+    glm::vec3 up,
+    glm::vec3 world_up,
+    float pitch_deg,
+    float yaw_deg)
+    : move_speed { move_speed }
+    , mouse_sensitivity { mouse_sensitivity }
+    , pitch_min { pitch_min }
+    , pitch_max { pitch_max }
+    , fov_min { fov_min }
+    , fov_max { fov_max }
+    , pos { position }
+    , front {}
+    , up { up }
+    , right {}
+    , world_up { world_up }
+    , fov_deg { fov_deg }
+    , pitch_deg { pitch_deg }
+    , yaw_deg { yaw_deg } {
+
+    this->update_vectors();
+}
+
+// public
+
+float Camera::get_fov_rad() const {
+    return glm::radians(this->fov_deg);
+}
+
+glm::mat4 Camera::get_view_matrix() const {
+    return glm::lookAt(this->pos, this->pos + this->front, this->up);
+}
+
+void Camera::move_to_direction(
+    const Camera::Direction direction,
+    const float delta_time) {
+
+    const float speed { this->move_speed * delta_time };
+
+    switch (direction) {
+    case Direction::FORWARD:
+        this->pos += this->front * speed;
+        break;
+
+    case Direction::BACKWARD:
+        this->pos -= this->front * speed;
+        break;
+
+    case Direction::LEFT:
+        this->pos -= this->right * speed;
+        break;
+
+    case Direction::RIGHT:
+        this->pos += this->right * speed;
+        break;
+
+    case Direction::UP:
+        this->pos += this->up * speed;
+        break;
+
+    case Direction::DOWN:
+        this->pos -= this->up * speed;
+        break;
+    }
+}
+
+void Camera::process_mouse_move(
+    float offset_x,
+    float offset_y,
+    const bool constrain_pitch) {
+
+    offset_x *= this->mouse_sensitivity;
+    offset_y *= this->mouse_sensitivity;
+
+    this->yaw_deg += offset_x;
+    this->pitch_deg -= offset_y;
+
+    if (constrain_pitch) {
+        if (this->pitch_deg > this->pitch_max) {
+            this->pitch_deg = this->pitch_max;
+        } else if (this->pitch_deg < this->pitch_min) {
+            this->pitch_deg = this->pitch_min;
+        }
+    }
+
+    this->update_vectors();
+}
+
+void Camera::process_mouse_scroll(float offset_y) {
+    this->fov_deg -= offset_y;
+    if (this->fov_deg < this->fov_min) {
+        this->fov_deg = this->fov_min;
+    } else if (this->fov_deg > this->fov_max) {
+        this->fov_deg = this->fov_max;
+    }
+}
+
+// private
+
+void Camera::update_vectors() {
+    this->front = glm::normalize(glm::vec3 {
+        std::cos(glm::radians(this->yaw_deg)) * std::cos(glm::radians(this->pitch_deg)),
+        std::sin(glm::radians(this->pitch_deg)),
+        std::sin(glm::radians(this->yaw_deg)) * std::cos(glm::radians(this->pitch_deg)) });
+    
+    this->right = glm::normalize(glm::cross(this->front, this->world_up));
+    this->up = glm::normalize(glm::cross(this->right, this->front));
+}

src/Shader.cpp

@@ -0,0 +1,86 @@
+#include <print>
+#include <string>
+#include <filesystem>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+#include "glad/glad.h"
+
+#include "Shader.hpp"
+#include "quit.hpp"
+#include "util.hpp"
+
+Shader::Shader(std::filesystem::path& vertex_path, std::filesystem::path& fragment_path)
+    : id{0} {
+
+        std::string vertex_code { read_entire_file(vertex_path) };
+        std::string fragment_code { read_entire_file(fragment_path) };
+        if (vertex_code == "" || fragment_code == "") {
+            quit(1);
+        }
+
+        const char* vertex_code_c_str { vertex_code.c_str() };
+        const char* fragment_code_c_str { fragment_code.c_str() };
+
+        unsigned int vertex_shader { glCreateShader(GL_VERTEX_SHADER) };
+        if (vertex_shader == 0) {
+            std::println(stderr, "Failed to create vertex shader.");
+            quit(1);
+        }
+
+        glShaderSource(vertex_shader, 1, &vertex_code_c_str, nullptr);
+        glCompileShader(vertex_shader);
+        check_shader_compile_error(vertex_shader);
+
+        unsigned int fragment_shader { glCreateShader(GL_FRAGMENT_SHADER) };
+        if (fragment_shader == 0) {
+            std::println(stderr, "Failed to create fragment shader.");
+            quit(1);
+        }
+
+        glShaderSource(fragment_shader, 1, &fragment_code_c_str, nullptr);
+        glCompileShader(fragment_shader);
+        check_shader_compile_error(fragment_shader);
+
+        this->id = glCreateProgram();
+        if (this->id == 0) {
+            std::println(stderr, "Failed to create shader program");
+            quit(1);
+        }
+
+        glAttachShader(this->id, vertex_shader);
+        glAttachShader(this->id, fragment_shader);
+
+        glLinkProgram(this->id);
+        check_shader_program_link_error(this->id);
+
+        glDeleteShader(vertex_shader);
+        glDeleteShader(fragment_shader);
+    }
+
+unsigned int Shader::get_id() const {
+    return this->id;
+}
+
+void Shader::use() const {
+    glUseProgram(this->id);
+}
+
+void Shader::set_mat4(const std::string_view& name, const glm::mat4& value) {
+    const int uniform { glGetUniformLocation(this->id, name.data()) };
+    if (uniform == -1) {
+        std::println(stderr, "Could not find uniform '{}'.", name);
+        quit(1);
+    }
+    glUniformMatrix4fv(uniform, 1, GL_FALSE, glm::value_ptr(value));
+}
+
+void Shader::set_vec4(const std::string_view& name, const glm::vec4& value) {
+    const int uniform { glGetUniformLocation(this->id, name.data()) };
+    if (uniform == -1) {
+        std::println(stderr, "Could not find uniform '{}'.", name);
+        quit(1);
+    }
+    glUniform4fv(uniform, 1, glm::value_ptr(value));
+}

src/Shape.cpp

@@ -0,0 +1,104 @@
+#include <memory>
+#include <map>
+#include <string>
+
+#include <glm/ext/matrix_transform.hpp>
+
+#include "glad/glad.h"
+#include <GLFW/glfw3.h>
+
+#include "Shape.hpp"
+
+
+// Shape class
+
+// Constructors
+
+Shape::Shape(
+        std::shared_ptr<Shader> shader,
+        ShapeInfo& shapeInfo,
+        glm::vec3 pos
+        )
+    : rotation { 0.0f, 0.0f, 0.0f }
+    , vertices { shapeInfo.vertices }
+    , indices { shapeInfo.indices }
+    , pos { pos }
+    , vao { 0 }
+    , vbo { 0 }
+    , ebo { 0 }
+    , shader {shader} {
+
+    int orig_vao { 0 };
+    int orig_vbo { 0 };
+    int orig_ebo { 0 };
+    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &orig_vao);
+    glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &orig_vbo);
+    glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &orig_ebo);
+
+    glGenVertexArrays(1, &this->vao);
+    glBindVertexArray(this->vao);
+
+    glGenBuffers(1, &this->vbo);
+    glBindBuffer(GL_ARRAY_BUFFER, this->vbo);
+    glBufferData(GL_ARRAY_BUFFER, this->vertices.size() * sizeof(float), this->vertices.data(), GL_STATIC_DRAW);
+
+    unsigned int attrib_index { 0 };
+    int elem_count { 3 };
+    GLenum data_type { GL_FLOAT };
+    bool normalize { false };
+    std::size_t stride { 3 * sizeof(float) };
+    void* first_value { (void*) 0 };
+    glVertexAttribPointer(attrib_index, elem_count, data_type, normalize, stride, first_value);
+    glEnableVertexAttribArray(0);
+
+    glGenBuffers(1, &this->ebo);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->ebo);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, this->indices.size() * sizeof(unsigned int), this->indices.data(), GL_STATIC_DRAW);
+
+    glBindVertexArray(orig_vao);
+    glBindBuffer(GL_ARRAY_BUFFER, orig_vbo);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, orig_ebo);
+}
+
+// private
+
+void Shape::draw() const {
+    int orig_vao { 0 };
+    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &orig_vao);
+
+    glm::mat4 model { 1.0f };
+    model = glm::translate(model, this->pos);
+    for (int i { 0 }; i < this->rotation.length(); i++) {
+        const float rot_amount { this->rotation[i] };
+        if (rot_amount != 0.0f) {
+            glm::vec3 rot_axis { 0.0f };
+            rot_axis[i] = 1.0f;
+            model = glm::rotate(model, glm::radians(rot_amount), rot_axis);
+        }
+    }
+    this->shader->set_mat4("model", model);
+
+    glBindVertexArray(this->vao);
+    glDrawElements(GL_TRIANGLES, this->indices.size(), GL_UNSIGNED_INT, nullptr);
+
+    glBindVertexArray(orig_vao);
+}
+
+
+// Premade shapes
+
+std::map<std::string, ShapeInfo> shapes {
+    {
+        "triangle",
+        {
+            .vertices = {
+                0.0f, 0.5f, 0.0f,   // top
+                -0.5f, -0.5f, 0.0f, // right
+                0.5f, -0.5f, 0.0f,  // left
+            },
+            .indices = {
+                0, 1, 2
+            }
+        }
+    }
+};

src/headers/Camera.hpp

@@ -0,0 +1,63 @@
+#pragma once
+
+#include <glm/glm.hpp>
+
+class Camera {
+public:
+    enum class Direction {
+        FORWARD,
+        BACKWARD,
+        LEFT,
+        RIGHT,
+        UP,
+        DOWN
+    };
+
+    float move_speed;
+    float mouse_sensitivity;
+    float pitch_min;
+    float pitch_max;
+    float fov_min;
+    float fov_max;
+
+    Camera(
+        glm::vec3 position,
+        float fov_deg,
+        float fov_max,
+        float move_speed,
+        float mouse_sensitivity,
+        float fov_min = 0.0f,
+        float pitch_min = -89.0f,
+        float pitch_max = 89.0f,
+        glm::vec3 up = { 0.0f, 1.0f, 0.0f },
+        glm::vec3 world_up = { 0.0f, 1.0f, 0.0f },
+        float pitch_deg = 0.0f,
+        float yaw_deg = -90.0f);
+
+    float get_fov_rad() const;
+
+    glm::mat4 get_view_matrix() const;
+
+    void move_to_direction(
+        const Camera::Direction direction,
+        const float delta_time);
+
+    void process_mouse_move(
+        float offset_x,
+        float offset_y,
+        const bool constrain_pitch = true);
+
+    void process_mouse_scroll(float offset_y);
+
+private:
+    glm::vec3 pos;
+    glm::vec3 front;
+    glm::vec3 up;
+    glm::vec3 right;
+    glm::vec3 world_up;
+    float fov_deg;
+    float pitch_deg;
+    float yaw_deg;
+
+    void update_vectors();
+};

src/headers/KHR/khrplatform.h

@@ -0,0 +1,311 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+/*
+ * To support platform where unsigned long cannot be used interchangeably with
+ * inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
+ * Ideally, we could just use (u)intptr_t everywhere, but this could result in
+ * ABI breakage if khronos_uintptr_t is changed from unsigned long to
+ * unsigned long long or similar (this results in different C++ name mangling).
+ * To avoid changes for existing platforms, we restrict usage of intptr_t to
+ * platforms where the size of a pointer is larger than the size of long.
+ */
+#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
+#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
+#define KHRONOS_USE_INTPTR_T
+#endif
+#endif
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef KHRONOS_USE_INTPTR_T
+typedef intptr_t               khronos_intptr_t;
+typedef uintptr_t              khronos_uintptr_t;
+#elif defined(_WIN64)
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+#endif
+
+#if defined(_WIN64)
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */

src/headers/Shader.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <string_view>
+#include <filesystem>
+
+#include <glm/glm.hpp>
+
+class Shader {
+public:
+    Shader(std::filesystem::path& vertex_path, std::filesystem::path& fragment_path);
+
+    unsigned int get_id() const;
+
+    void use() const;
+    void set_mat4(const std::string_view& name, const glm::mat4& value);
+    void set_vec4(const std::string_view& name, const glm::vec4& value);
+
+private:
+    unsigned int id;
+};

src/headers/Shape.hpp

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <vector>
+#include <memory>
+
+#include <glm/glm.hpp>
+
+#include "Shader.hpp"
+
+struct ShapeInfo {
+    std::vector<float> vertices;
+    std::vector<unsigned int> indices;
+};
+
+class Shape {
+public:
+    glm::vec3 rotation;
+
+    Shape(
+            std::shared_ptr<Shader> shader,
+            ShapeInfo& shapeInfo,
+            glm::vec3 pos = { 0.0f, 0.0f, 0.0f }
+            );
+
+    void draw() const;
+
+private:
+    std::vector<float> vertices;
+    std::vector<unsigned int> indices;
+    glm::vec3 pos;
+    unsigned int vao;
+    unsigned int vbo;
+    unsigned int ebo;
+
+    std::shared_ptr<Shader> shader;
+};

src/headers/quit.hpp

@@ -0,0 +1,3 @@
+#pragma once
+
+void quit(int code);

src/headers/settings.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <filesystem>
+#include <string>
+
+struct Settings {
+    std::filesystem::path vertex_shader_path;
+    std::filesystem::path fragment_shader_path;
+
+    void init();
+    std::string str() const;
+};

src/headers/util.hpp

@@ -0,0 +1,6 @@
+#include <string>
+#include <filesystem>
+
+std::string read_entire_file(std::filesystem::path& path);
+void check_shader_compile_error(const unsigned int shader_id);
+void check_shader_program_link_error(const unsigned int program);

src/main.cpp

@@ -0,0 +1,213 @@
+#include <map>
+#include <print>
+#include <string>
+
+#include "glad/glad.h"
+#include <GLFW/glfw3.h>
+
+#include <glm/ext/matrix_clip_space.hpp>
+#include <glm/ext/matrix_transform.hpp>
+#include <glm/glm.hpp>
+
+#include "Camera.hpp"
+#include "Shader.hpp"
+#include "Shape.hpp"
+#include "quit.hpp"
+#include "settings.hpp"
+
+extern std::map<std::string, ShapeInfo> shapes;
+
+int window_width { 800 };
+int window_height { 600 };
+
+static struct {
+    float last_x;
+    float last_y;
+} mouse {
+    .last_x = window_width / 2.0f,
+    .last_y = window_height / 2.0f
+};
+
+Settings settings {};
+
+float delta {};
+
+Camera camera {
+    glm::vec3 { 0.0f, 0.0f, 1.0f },
+    70.0f,
+    70.0f,
+    1.0f,
+    0.1f
+};
+
+void print_glfw_error() {
+    const char* desc {};
+    const int err { glfwGetError(&desc) };
+    std::println(stderr, "GLFW Error. code: {}, desc: {}", err, desc);
+}
+
+void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
+    (void) window;
+    window_width = width;
+    window_height = height;
+    glViewport(0, 0, width, height);
+}
+
+void mouse_callback(GLFWwindow* window, double xpos, double ypos) {
+    (void) window;
+
+    static bool first_mouse_input { true };
+
+    if (first_mouse_input) {
+        mouse.last_x = xpos;
+        mouse.last_y = ypos;
+        first_mouse_input = false;
+    }
+
+    float offset_x { static_cast<float>(xpos) - mouse.last_x };
+    float offset_y { static_cast<float>(ypos) - mouse.last_y };
+    mouse.last_x = xpos;
+    mouse.last_y = ypos;
+
+    camera.process_mouse_move(offset_x, offset_y);
+}
+
+void mouse_scroll_callback(GLFWwindow* window, double xoffset, double yoffset) {
+    (void) window;
+    (void) xoffset;
+
+    camera.process_mouse_scroll(yoffset);
+}
+
+void process_keyboard_input(GLFWwindow* window) {
+    // Window
+    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
+        glfwSetWindowShouldClose(window, true);
+        return;
+    }
+
+    // Camera
+    if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
+        camera.move_to_direction(Camera::Direction::FORWARD, delta);
+    } else if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
+        camera.move_to_direction(Camera::Direction::BACKWARD, delta);
+    }
+
+    if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) {
+        camera.move_to_direction(Camera::Direction::LEFT, delta);
+    } else if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
+        camera.move_to_direction(Camera::Direction::RIGHT, delta);
+    }
+
+    if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS) {
+        camera.move_to_direction(Camera::Direction::UP, delta);
+    } else if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS) {
+        camera.move_to_direction(Camera::Direction::DOWN, delta);
+    }
+}
+
+int main() {
+    settings.init();
+    std::println(
+        "-----------------------------------------\n"
+        "Settings:\n\n"
+        "{}\n"
+        "-----------------------------------------\n",
+        settings.str());
+
+    if (glfwInit() != GLFW_TRUE) {
+        print_glfw_error();
+        quit(1);
+    }
+
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
+
+    GLFWwindow* window { glfwCreateWindow(
+        window_width,
+        window_height,
+        "LuaGl",
+        nullptr,
+        nullptr) };
+    if (window == nullptr) {
+        print_glfw_error();
+        quit(1);
+    }
+
+    glfwMakeContextCurrent(window);
+
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+    glfwSetCursorPosCallback(window, mouse_callback);
+    glfwSetScrollCallback(window, mouse_scroll_callback);
+
+    if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) {
+        std::println(stderr, "Failed to init GLAD.");
+        quit(1);
+    }
+
+    glViewport(0, 0, window_width, window_height);
+    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+
+    glEnable(GL_DEPTH_TEST);
+
+    auto shader { std::make_shared<Shader>(settings.vertex_shader_path, settings.fragment_shader_path) };
+    shader->use();
+
+    std::vector<Shape> created_shapes {
+        { shader, shapes.at("triangle"), { 0.0f, 0.0f, 0.0f } },
+        { shader, shapes.at("triangle"), { 0.5f, 0.0f, -0.5f } },
+        { shader, shapes.at("triangle"), { -0.5f, 0.0f, -0.5f } },
+        { shader, shapes.at("triangle"), { 0.0f, 0.0f, -1.0f } }
+    };
+
+    created_shapes.at(1).rotation.y = 90.0f;
+    created_shapes.at(2).rotation.y = 90.0f;
+
+    std::array<glm::vec4, 4> colors {
+        glm::vec4 { 1.0f, 0.0f, 0.0f, 0.0f },
+        { 0.0f, 1.0f, 0.0f, 0.0f },
+        { 0.0f, 0.0f, 1.0f, 0.0f },
+        { 1.0f, 1.0f, 0.0f, 0.0f },
+    };
+
+    long unsigned int frame { 0 };
+    float last_frame_time { 0 };
+    while (!glfwWindowShouldClose(window)) {
+        const float current_time { static_cast<float>(glfwGetTime()) };
+        delta = current_time - last_frame_time;
+        last_frame_time = current_time;
+
+        std::println("Frame: {}", frame);
+        frame++;
+
+        process_keyboard_input(window);
+
+        glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        glm::mat4 view { camera.get_view_matrix() };
+        shader->set_mat4("view", view);
+
+        float aspect_ratio { static_cast<float>(window_width) / window_height };
+        constexpr float near_plane { 0.1f };
+        constexpr float far_plane { 100.0f };
+        const glm::mat4 projection {
+            glm::perspective(
+                camera.get_fov_rad(),
+                aspect_ratio,
+                near_plane,
+                far_plane)
+        };
+        shader->set_mat4("projection", projection);
+
+        for (int i { 0 }; i < created_shapes.size(); i++) {
+            shader->set_vec4("thecolor", colors[i]);
+            created_shapes[i].draw();
+        }
+
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+    }
+
+    quit(0);
+}

src/quit.cpp

@@ -0,0 +1,8 @@
+#include <cstdlib>
+
+#include <GLFW/glfw3.h>
+
+void quit(int code) {
+    glfwTerminate();
+    std::exit(code);
+}

src/settings.cpp

@@ -0,0 +1,19 @@
+#include <filesystem>
+#include <string>
+#include <format>
+
+#include "settings.hpp"
+
+void Settings::init() {
+    this->vertex_shader_path = std::filesystem::canonical(VERTEX_SHADER_PATH);
+    this->fragment_shader_path = std::filesystem::canonical(FRAGMENT_SHADER_PATH);
+}
+
+std::string Settings::str() const {
+    return std::format(
+            "vertex_shader_path  : {}\n"
+            "fragment_shader_path: {}",
+            this->vertex_shader_path.c_str(),
+            this->fragment_shader_path.c_str()
+            );
+}

src/shaders/shader.frag

@@ -0,0 +1,10 @@
+#version 460 core
+
+out vec4 frag_color;
+
+uniform vec4 thecolor;
+
+void main() {
+    // frag_color = vec4(1.0f, 0.0f, 0.0f, 1.0f);
+    frag_color = thecolor;
+}

src/shaders/shader.vert

@@ -0,0 +1,11 @@
+#version 460 core
+
+layout (location = 0) in vec3 a_pos;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main() {
+    gl_Position = projection * view * model * vec4(a_pos, 1.0f);
+}

src/util.cpp

@@ -0,0 +1,47 @@
+#include <print>
+#include <string>
+#include <fstream>
+#include <sstream>
+#include <filesystem>
+
+#include "glad/glad.h"
+
+#include "util.hpp"
+#include "quit.hpp"
+
+std::string read_entire_file(std::filesystem::path& path) {
+    std::ifstream file_stream;
+    file_stream.exceptions(std::ifstream::failbit | std::ifstream::badbit);
+
+    try {
+        file_stream.open(path);
+        std::stringstream string_stream;
+        string_stream << file_stream.rdbuf();
+        return string_stream.str();
+    } catch (std::ifstream::failure& e) {
+        std::println(stderr, "Failed to read file '{}'. {}", path.c_str(), e.what());
+        return "";
+    }
+}
+
+void check_shader_compile_error(const unsigned int shader_id) {
+    int success {};
+    glGetShaderiv(shader_id, GL_COMPILE_STATUS, &success);
+    if (!success) {
+        char info_log[512];
+        glGetShaderInfoLog(shader_id, 512, nullptr, info_log);
+        std::println(stderr, "Shader compilation failed: {}", info_log);
+        quit(1);
+    }
+}
+
+void check_shader_program_link_error(const unsigned int program) {
+    int success {};
+    glGetProgramiv(program, GL_LINK_STATUS, &success);
+    if (!success) {
+        char info_log[512];
+        glGetProgramInfoLog(program, 512, nullptr, info_log);
+        std::println(stderr, "Linking shader program failed: {}", info_log);
+        quit(1);
+    }
+}